: I have an older home with a well and galvanized mainline. I'm receiving a lot of sediment in my faucets and appliances, primarily rust, yet the well pipe is fairly new. Knowing I need to filter, I found a good location to install shortly after the pressure tank and main shutoff. My question is, can I remove the 4' section of steel pipe and incorporate my inline filter, shutoffs, and CPVC piping back into this section? Are there CPVC fittings that apply to steel unions, or is this not recommended?

I don't see why you can't replace that piece of pipe but, galvanized uses threaded fittings so you adapt to it with a threaded CPVC fitting.

But before you jump into that type filter you need to look at where the rust is coming from and the cause of it. If not you run the risk of your new pipe not lasting long while filling with rust as it rusts. I suggest you have a water analysis done.